IDY25400: single-level "group4" fields

A number of raw and post-processed NWP products are available as outputs from the Australian Community Climate Earth-System Simulator (ACCESS) suite of Numerical Weather Prediction models which are run routinely by the Bureau of Meteorology's National Meteorological & Oceanographic Centre (NMOC). This document describes the content of the ACCESS-C VICTAS (version APS0) IDY25400.group4.slv.YYYYMMDDHH.HHH.surface series of products.

Model summary

ACCESS-C VICTAS covers the Victoria/Tasmania domain, has a resolution of about 5 km and is run twice per day (00Z and 12Z basetimes) out to a forecast hour of +36. This model is nested in the ACCESS-R model and consists of only a forecast component.

NWP data filename convention

All NWP files in this product series have names that conform to the following convention:

IDY25400.group4.slv.YYYYMMDDHH.HHH.surface.grb or IDY25400.group4.slv.YYYYMMDDHH.HHH.surface.nc

Land mask (takes the value 1 if any land is in the grid box, otherwise
0). [0/1]

211.229

vis_prob

Probability of horizontal visibility at approximately 1.5m above-ground-
level being less than 5 km. Please note that this diagnostic has not be
tuned for Australian conditions and does not include dynamic atmospheric
particulate densities, which is an important part of the algorithm used
to generate this field. At this stage this field is considered
experimental and should be used with due caution. [0-1]

109.128

z0

Roughness length. [m]

081.128

qsair_scrn

Atmospheric specific humidity at 1.5m above-ground-level (screen level).
Calculated by integrating the similarity equations from the surface to
1.5m (surface value taken as saturated specific humidity at the surface
temperature). [kg kg-1]

Fields in the above tables are listed in the same order as shown in the Parameters section of this document.

The nature of fields can not always be deduced easily from their NetCDF variable names. It is always safest to refer to the detailed description of a parameter.

All accumulated fields are accumulated from the start of the model assimilation window. Hence any of these fields can be non-zero at the model base-time (which is a time-step at the center of the assimilation window).